How Font Steganography Decoding Works
The decoding process analyzes the font sizes in the footer area of your
PDF's last page:
-
Extracts text elements from the document footer on the last page
- Identifies characters with 7pt font size as binary "0"
- Identifies characters with 9pt font size as binary "1"
- Ignores space characters (they use 8pt and don't encode data)
-
Ignores cover story text (8pt gray text explaining font variations)
- Converts the resulting binary string back to ASCII text
Requirements for Successful Decoding
-
PDF must contain text encoded with font steganography on the last page
- Text must be in the footer area of the last page
- Font sizes must be exactly 7pt or 9pt for data characters
- Binary data must form complete 8-bit bytes
Troubleshooting
If decoding fails, the PDF might not contain steganographic data on the
last page, or the encoding might have been altered. Only PDFs created
with our encoding tool can be reliably decoded.